12 Questions
Who discovered that the charge of the nucleus increased from one element to another in units of one?
Henry Moseley
What type of particles did Ernest Rutherford discover in the nucleus?
Protons
What did Rutherford predict to explain the heavier than expected weight of atomic nuclei?
Neutrons
Why did scientists modify Rutherford's nuclear model even though it seemed convincing?
To explain the heavier mass of atomic nuclei
Which ancient Greeks thought that all matter was made from indivisible particles?
None of the above
Who described atoms as solid spheres at the start of the 19th century?
John Dalton
Which model replaced the 'solid sphere' atomic structure idea?
Plum pudding model
What observation led to the modification of atomic models according to the text?
Few alpha particles strongly deflected by the nucleus
What did J. J. Thomson's experiments in 1897 reveal about atoms?
Atoms contain even smaller, negatively charged particles known as electrons.
What did Rutherford's gold foil experiment show about the plum pudding model?
Most of the alpha particles passed straight through the gold atoms.
What is the main feature of Rutherford's nuclear model of the atom?
There is a positively charged nucleus at the center where most of the mass is concentrated.
Why did Rutherford conclude that the plum pudding model was incorrect?
Because all alpha particles passed straight through the gold foil.
Test your understanding of how scientific knowledge develops based on new evidence and theories. Explore the concepts of peer review, the structure of an atom, and the evolution of Rutherford's nuclear model.
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